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Posted to mapreduce-issues@hadoop.apache.org by "Tom White (Commented) (JIRA)" <ji...@apache.org> on 2011/11/04 23:25:51 UTC
[jira] [Commented] (MAPREDUCE-3344) o.a.h.mapreduce.Reducer since
0.21 blindly casts to ReduceContext.ValueIterator
[ https://issues.apache.org/jira/browse/MAPREDUCE-3344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13144412#comment-13144412 ]
Tom White commented on MAPREDUCE-3344:
--------------------------------------
+1
> o.a.h.mapreduce.Reducer since 0.21 blindly casts to ReduceContext.ValueIterator
> -------------------------------------------------------------------------------
>
> Key: MAPREDUCE-3344
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3344
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 0.21.0, 0.22.0, 0.23.0, 0.24.0, 0.23.1
> Reporter: Brock Noland
> Attachments: MAPREDUCE-3344-1.patch
>
>
> 0.21 mapreduce.Reducer introduced a blind cast to ReduceContext.ValueIterator. There should an instanceof check around this block to ensure we don't throw a CastClassException:
> {code}
> // If a back up store is used, reset it
> ((ReduceContext.ValueIterator)
> (context.getValues().iterator())).resetBackupStore();
> {code}
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